110 



THE WORLD OF LIFE 



CHAP. 



shown by the upper somewhat irregularly curved line of 

 dots. This is seen to vary from 4.4 inches to a little less 



Inches 



5 2 2 3 4 3 6 7 8 9 lO 22 22 23 14 15 26 17 18 J? 2Q $ 



2. 



I 



0. 



1 2 3 4 5 6 7 8 9 lO U 12 13 14 15 16 17 13 29 20 

 Rice-hird ( Dolichonyx-oryzivorus .J 20 Males. 



Fig. io. — Diagram of Variation. 



than 5 inches. The next lower line shows the length of the 

 wing of each specimen, and we at once see the want of 



